The proposal calls for a cafe and fitness center totaling 2,578 square feet as well as 6,144 square feet of office space on both the second and third floors.

The building currently totals more than 108,000 square feet: 56,440 square feet used for office, 28,220 square feet for research and development, 9,770 square feet for light manufacturing and 14,103 square feet for storage, according to paperwork filed by Robert Duval, chief engineer with TFMoran, a Bedford engineering firm working on the project.

Duval said “we anticipate the traffic impacts associated with this office addition are minimal” with one additional trip every five or six minutes.

“We therefore conclude that the traffic impacts of this proposal will not negatively impact the adjacent roadway network,” Duval wrote.

A city staff report said the traffic review was flawed.

“The city’s traffic engineer has reviewed the findings outlined in the traffic memorandum and has determined that the methodology used was insufficient for a complete review,” said the staff report.

The traffic estimate should have factored in the number of employees and square footage of office space, but only based the estimate on the square footage. That produced only about half the increased traffic had it been done correctly, according to the staff report.

TFMoran officials couldn’t be reached Tuesday.

The building, originally built as an insurance office in 1984, contains 374 parking spaces, more than the 227 spaces required by the city’s zoning ordinance.

A company spokesman said senior company officials weren’t available this week to provide additional information.